According to the Big Mac Index, if a country's currency is undervalued, it could mean that wages there are lower than in the US. If Sri Lanka is 0.41% undervalued, it means that the Sri Lankan Rupee is slightly cheap compared to the US dollar based on how much a Big Mac costs. When a currency is overvalued, the price of a Big Mac in that country is usually less than the price of a Big Mac in the US. This could mean that the cost of living in Sri Lanka is lower than in the United States. This could then mean that wages in Sri Lanka are also lower than in the United States. But it's important to remember that the Big Mac Index is just a simple way to compare the values of different currencies. It's not a straight way to measure wage levels. There are many things that affect wage levels, such as the job market, job opportunities, factors that are unique to each field, and government policies. If a currency is undervalued, it may give you some idea of how much things cost, but it shouldn't be the only thing you use to judge price